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Tailcalls are only OK with forwarded sret pointers. With explicit sret, one approximation is to check that the pointer isn't an Instruction, as in that case it might point into some local memory (alloca). That's not OK with tailcalls. Explicit sret counterpart to r233409. Differential Revison: http://reviews.llvm.org/D8510 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233410 91177308-0d34-0410-b5e6-96231b3b80d8
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